On Friday 05 February 2010, Mark Brown wrote: > Allow I2C drivers to make use of the runtime PM framework by adding > bus implementations of the runtime PM operations. These simply > immediately suspend when the device is idle. The runtime PM framework > provides drivers with off the shelf refcounts for enables and sysfs > control for managing runtime suspend from userspace so is useful even > without meaningful input from the bus. > > Signed-off-by: Mark Brown <broonie@xxxxxxxxxxxxxxxxxxxxxxxxxxx> Acked-by: Rafael J. Wysocki <rjw@xxxxxxx> > --- > > Changed to allow drivers to use the idle callback to veto suspend. > > drivers/i2c/i2c-core.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++ > 1 files changed, 50 insertions(+), 0 deletions(-) > > diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c > index 10be7b5..4131698 100644 > --- a/drivers/i2c/i2c-core.c > +++ b/drivers/i2c/i2c-core.c > @@ -34,6 +34,7 @@ > #include <linux/hardirq.h> > #include <linux/irqflags.h> > #include <linux/rwsem.h> > +#include <linux/pm_runtime.h> > #include <asm/uaccess.h> > > #include "i2c-core.h" > @@ -184,6 +185,52 @@ static int i2c_device_pm_resume(struct device *dev) > #define i2c_device_pm_resume NULL > #endif > > +#ifdef CONFIG_PM_RUNTIME > +static int i2c_device_runtime_suspend(struct device *dev) > +{ > + const struct dev_pm_ops *pm; > + > + if (!dev->driver) > + return 0; > + pm = dev->driver->pm; > + if (!pm || !pm->runtime_suspend) > + return 0; > + return pm->runtime_suspend(dev); > +} > + > +static int i2c_device_runtime_resume(struct device *dev) > +{ > + const struct dev_pm_ops *pm; > + > + if (!dev->driver) > + return 0; > + pm = dev->driver->pm; > + if (!pm || !pm->runtime_resume) > + return 0; > + return pm->runtime_resume(dev); > +} > + > +static int i2c_device_runtime_idle(struct device *dev) > +{ > + const struct dev_pm_ops *pm = NULL; > + int ret; > + > + if (dev->driver) > + pm = dev->driver->pm; > + if (pm && pm->runtime_idle) { > + ret = pm->runtime_idle(dev); > + if (ret) > + return ret; > + } > + > + return pm_runtime_suspend(dev); > +} > +#else > +#define i2c_device_runtime_suspend NULL > +#define i2c_device_runtime_resume NULL > +#define i2c_device_runtime_idle NULL > +#endif > + > static int i2c_device_suspend(struct device *dev, pm_message_t mesg) > { > struct i2c_client *client = i2c_verify_client(dev); > @@ -251,6 +298,9 @@ static const struct attribute_group *i2c_dev_attr_groups[] = { > static const struct dev_pm_ops i2c_device_pm_ops = { > .suspend = i2c_device_pm_suspend, > .resume = i2c_device_pm_resume, > + .runtime_suspend = i2c_device_runtime_suspend, > + .runtime_resume = i2c_device_runtime_resume, > + .runtime_idle = i2c_device_runtime_idle, > }; > > struct bus_type i2c_bus_type = { > -- To unsubscribe from this list: send the line "unsubscribe linux-i2c" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html